text: SP-B plays a critical role in the functioning of healthy lungs, and its absence inevitably leads to lung conditions, most common of which being acute respiratory distress syndrome (ARDS).  Because of this, SP-B's function has been well researched, and has been found to exist in three parts. Beyond these three functions, it is worth noting that SP-B is also thought to have some anti-inflammatory function, though it is not well defined.